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AUSTIN, Texas -- Lance Armstrong has finally come clean.

Armstrong confessed to doping during an interview with Oprah Winfrey taped Monday, just a couple of hours after a wrenching apology to staff at the Livestrong charity he founded and has now been forced to surrender.

The day ended with 2½ hours of questions from Winfrey at a downtown Austin hotel, where she said the world's most famous cyclist was "forthcoming" as she asked him in detail about doping allegations that followed him throughout his seven Tour de France victories.

Speaking on "CBS This Morning," Winfrey said Tuesday she had not planned to address Armstrong's confession before the interview aired on her OWN network but, "by the time I left Austin and landed in Chicago, you all had already confirmed it."

"So I'm sitting here now because it's already been confirmed," she added.

The session was to be broadcast on Thursday but Winfrey said it will now run in two parts over two nights because there is so much material. The interview will be shown beginning at 9 p.m. both Thursday and Friday in 90-minute shows.

Winfrey would not characterize whether Armstrong seemed contrite but said he seemed ready for the interview. "I would say that he met the moment," she said.

"I don't think 'emotional' begins to describe the intensity or the difficulty he experienced in talking about some of these things."

The confession was a stunning reversal for a proud athlete and celebrity who sought lavish praise in the court of public opinion and used courtrooms to punish his critics.

The World Anti-Doping Agency said Armstrong must confess under oath to seek a reduction in his lifetime ban from sports.

WADA director general David Howman told The Associated Press that Armstrong's interview with Winfrey is "hardly the same as giving evidence to a relevant authority" that deals with doping rules and sanctions. "He's got to follow a certain course," Howman said. "That is not talking to a talk show host." International Olympic Committee vice president Thomas Bach said Armstrong should provide a complete confession to USADA or WADA. "The TV interview is not the right platform," he told the AP.

Armstrong reportedly hopes to return to competition in recognized triathlon events.

WADA said "only when Mr. Armstrong makes a full confession under oath -- and tells the anti-doping authorities all he knows about doping activities -- can any legal and proper process for him to seek any reopening or reconsideration of his lifetime ban commence."

Howman said a reduced ban is possible depending on the level of cooperation. "Is he trying to do something for himself to have the sanctions changed?" Howman said. "Does he want to do something for the benefit of the sport itself? In both instances, he will need to make a full statement [under] oath." WADA also announced Tuesday that it will not participate in an investigation into links cycling's governing body allegedly had to Armstrong due to "serious concerns" about the inquiry. WADA told the International Cycling Union, which set up the inquiry, that it is unhappy that witnesses are not being offered immunity to encourage them to come forward with information following the sport's biggest doping scandal.

For more than a decade, Armstrong dared anybody who challenged his version of events to prove it. Finally, he told the tale himself after promising over the weekend to answer Winfrey's questions "directly, honestly and candidly."

The cyclist was stripped of his Tour titles, lost most of his endorsements and was forced to leave Livestrong last year after the U.S. Anti-Doping Agency issued a damning, 1,000-page report that accused him of masterminding a long-running doping scheme.

The International Cycling Union, or UCI, issued a statement on Tuesday saying it was aware of the reports that Armstrong had confessed to Winfrey. The governing body for the sport urged Armstrong to tell his story to an independent commission it has set up to examine claims it covered up suspicious samples from the cyclist, accepted financial donations from him and helped him avoid detection in doping tests.

Armstrong started Monday with a visit to the headquarters of Livestrong, the charity he founded in 1997 and turned into a global force on the strength of his athletic dominance and personal story of surviving testicular cancer that had spread to his lungs and brain.

About 100 Livestrong staff members gathered in a conference room as Armstrong told them "I'm sorry." He choked up during a 20-minute talk, expressing regret for the long-running controversy tied to performance-enhancers had caused, but stopped short of admitting he used them.

“

He used to be one of my husband's best friends and because he wouldn't go along with the doping, he got kicked to the side. Lance could have a positive impact if he tells the truth on everything. He's got to be completely honest.

” -- Betsy Andreu, wife of former
Lance Armstrong teammate Frankie Andreu

Before he was done, several members were in tears when he urged them to continue the charity's mission, helping cancer patients and their families.

"Heartfelt and sincere," is how Livestrong spokeswoman Katherine McLane described his speech.

Armstrong later huddled with almost a dozen people before stepping into a room set up at a downtown Austin hotel for the interview with Winfrey. The group included close friends and lawyers. They exchanged handshakes and smiles, but declined comment.

Winfrey has promoted her interview, one of the biggest for OWN since she launched the network in 2011, as a "no-holds barred" session, and after the voluminous USADA report -- which included testimony from 11 former teammates -- she said she went into the session with 112 questions ready to go. Not all of them were asked, she said, but many were.

USADA chief executive Travis Tygart, a longtime critic of Armstrong's, called the drug regimen practiced while Armstrong led the U.S. Postal Service team "the most sophisticated, professionalized and successful doping program that sport has ever seen." USADA did not respond to requests for comment about Armstrong's confession.

For years, Armstrong went after his critics ruthlessly during his reign as cycling champion. He scolded some in public and didn't hesitate to punish outspoken riders during the race itself. He waged legal battles against still others in court.

At least one of his opponents, the London-based Sunday Times, has already filed a lawsuit to recover about $500,000 it paid him to settle a libel case, and Dallas-based SCA Promotions, which tried to deny Armstrong a promised bonus for a Tour de France win, has threatened to bring another lawsuit seeking to recover more than $7.5 million awarded by an arbitration panel.

In Australia, the government of South Australia state said Tuesday it will seek the repayment of several million dollars in appearance fees paid to Armstrong for competing in the Tour Down Under in 2009, 2010 and 2011.

"We'd be more than happy for Mr. Armstrong to make any repayment of monies to us," South Australia Premier Jay Weatherill said.

“

Is he trying to do something for himself to have the sanctions changed? Does he want to do something for the benefit of the sport itself? In both instances, he will need to make a full statement [under] oath.

” -- WADA director general David Howman
on Lance Armstrong

Betsy Andreu, the wife of former Armstrong teammate Frankie Andreu, was one of the first to publicly accuse Armstrong of using performance-enhancing drugs. She called news of Armstrong's confession "very emotional and very sad," and choked up when asked to comment.

"He used to be one of my husband's best friends and because he wouldn't go along with the doping, he got kicked to the side," she said. "Lance could have a positive impact if he tells the truth on everything. He's got to be completely honest."

Betsy Andreu testified in SCA's arbitration case challenging the bonus in 2005, saying Armstrong admitted in an Indiana hospital room in 1996 that he had taken many performance-enhancing drugs, a claim Armstrong vehemently denied.

"It would be nice if he would come out and say the hospital room happened," Andreu said. "That's where it all started."

Former teammate Floyd Landis, stripped of the 2006 Tour de France title for doping, has filed a federal whistle-blower lawsuit that accused Armstrong of defrauding the U.S. Postal Service. An attorney familiar with Armstrong's legal problems told the AP that the Justice Department is highly likely to join the lawsuit. The False Claims Act lawsuit could result in Armstrong paying a substantial amount of money to the U.S. government. The deadline for the department to join the case is Thursday, though the department could seek an extension if necessary.

According to the attorney, who works outside the government, the lawsuit alleges that Armstrong defrauded the U.S. government based on his years of denying use of performance-enhancing drugs. The attorney spoke on condition of anonymity because the source was not authorized to speak on the record about the matter.

The lawsuit most likely to be influenced by a confession might be the Sunday Times case. Potential perjury charges stemming from Armstrong's sworn testimony in the 2005 arbitration fight would not apply because of the statute of limitations. Armstrong was not deposed during the federal investigation that was closed last year.

Armstrong is said to be worth around $100 million. But most sponsors dropped him after USADA's scathing report -- at the cost of tens of millions of dollars -- and soon after, he left the board of Livestrong.

After the USADA findings, he was also barred from competing in the elite triathlon or running events he participated in after his cycling career. World Anti-Doping Code rules state his lifetime ban cannot be reduced to less than eight years. WADA and U.S. Anti-Doping officials could agree to reduce the ban further depending on what information Armstrong provides and his level of cooperation.

Information from The Associated Press was used in this report.